Dont ever expect good performance when close to the weight limit of a mount, 50% of the stated limit is about where you should be. You'll be forever having tracking issues and straining the mount. I always got best performance with setting the scope up with all the gear (making sure cables are not free to dangle/tangle which slightly chanegs weight balance. Manuaaly slew to the position I want to image and balance it there as perfect as possible. THEN do my star alignment etc. by the time the mount is up and tracking my target its rock steady in that position. Being close enough is just not good enough.
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